When did LV open the Chamber?

[romuluslupin1]

No: HPFGUIDX 112537

Why does everybody think LV opened the CoS in 1942? I know 50 years 
before 1992 *is* 1942, but can we take the statement as meaning 
*exactly* 50 years? I mean, 50 is a round number, most people would 
say 50 to indicate any length of time between 45 and 55. The reason 
I doubt the date is Frank Bryce.

Let me clarify. We know TMR was in his 5th year when he opened the 
COS, and 16. Which means he could have AK'ed his muggle relative the 
next year. After he's 17, nobody's ever going to pick up his spells 
(it's only underage magic that's regulated, right?) he could go on a 
killing spree and the MOM would be none the wiser. So, if he opened 
the COS in 1942, by the summer of 1944 he would have kill his father 
(I don't think he'd have waited one minute longer than necessary, so 
he turns 17 sometime during his 6th year and by the end of the 
summer holiday he's done the deed).

Ok, now, Frank Bryce. The Little Hangletonians at the pub say that 
Frank hadn't been right in the head since his return form war. But 
the war ended in August 1945, and I got the impression Frank's odd 
behavior had been going on for a while before the Riddle died, nut 
just a few weeks.

Romulus Lupin, wondering if he's just too sleep deprived to see 
straight